For questions regarding the visual system, which serves to transduce light energy into neural impulses, or regarding visual perception, how we interpret such incoming visual information.

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6
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1answer
273 views

Does the structure of consciousness mimic that of the visual process?

It seems to me that the structure of the conscious mind has some strong similarities to the way our visual field functions. The visual field has a strong and detailed focus at the center, and this is ...
6
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1answer
124 views

How come we see a line when there isn't one in this picture?

I got this picture I generated myself and I don't understand how come we can see two diagonal lines when, I think, there is no actual lines. Zooming in: Center: Just another 2px wide square… ...
6
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1answer
291 views

How much red/orange is needed to stimulate hunger?

A common claim thrown around is that red and orange are great for restaurants because it stimulates hunger. However, I've heard time and time again that this does not work in web design because you ...
6
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0answers
58 views

Is our attention attracted by bright lights?

Bright lights are often used to attract human attention. For example, brightly lit signs, despite often being too bright to look at directly are often used for information and/or advertisement. Why ...
6
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0answers
104 views

Has there been a neuroscientific explanation of the color phi phenomenon?

The color phi phenomenon is a perceptual illusion in the visual domain which was demonstrated in an experiment by Kolers and von Grunau (1976). The experiment is as follows. A sequence of coloured ...
6
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0answers
46 views

Source for turning cone cell opponent process diagram into equations

There is a diagram on wikipedia that is part of the article on the opponent process. I assume practical equations have been developed, at least reasonable approximations, but they appear to be missing ...
5
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2answers
750 views

Where is the visual “image” that we “see” finally assembled?

David Hubel's online book, Eye, Brain and Vision describes in great detail our early visual system. The image that we are conscious of when we open our eyes goes through a complex path: The final ...
5
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2answers
229 views

Are closed eye movements related to the content of dreams or the imagination?

During rem sleep there are observed eye movements, which seem like they would correlate with the person visualizing their dreams. Do their eye movements actually try to follow what they're dreaming ...
5
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3answers
136 views

Are there any cognitive models for visual navigation?

I've seen a few neuroscience accounts of visual navigation and many A.I. projects, but no psychologically plausible accounts that actually solve the computational problem (i.e. produce a working ...
5
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2answers
112 views

Sensitivity of human eye to luminance

I heard once that the human eye has a logarithmic scale for luminance, e.g. to "feel" that a surface is three times as luminous compared to another, the former emits a light 8 times more powerful than ...
5
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2answers
322 views

Minimum duration for presenting a visual stimulus on screen

My experiment involves presenting simple visual stimuli briefly on screen (200 ms to 1000 ms). The stimuli would be simple enough (e.g. a circle and a line) but I want to use a range of durations to ...
5
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2answers
178 views

What is the minimum angle off horizontal before a line visually appears inclined at first glance?

Here is a straight line, which visually looks like a straight line: At first look (lets say minimum 2–3 sec.) the line below looks straight, but after some time you can see that it is actually an ...
5
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1answer
125 views

Distortion of faces presented serially in peripheral vision

I've kind of already answered this question for myself, but I can't resist sharing it anyway. Please feel welcome to add anything you can in another answer. Stare at the cross in the middle and try ...
5
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2answers
103 views

How fast is the visual system?

I've heard that the visual system is one of our slowest sensory systems. How fast is the visual system, and how does it compare to other sensory systems (auditory, mechanosensory, pain, etc.)? For ...
5
votes
1answer
151 views

Why is my Gabor patch not resizing as a function of the bounding box?

I'm trying to create a Gabor patch of variable size for an upcoming experiment. Below is the python function used to generate the code. The code was ported from this tutorial for Matlab (assume ...
5
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2answers
43 views

Do we have a predisposition to view visual stimuli in a clockwise pattern?

I understand that we typically view the center of the image first and then are likely to move on a horizontal axis, but is there evidence that we tend to follow a clockwise path when viewing more ...
5
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1answer
436 views

What is the brain power devoted to vision and haptics?

I heard a talk by Vincent Hayward on the sense of touch as a multi-modal system, where he claimed that the brain power devoted to haptics is at least as big as the one devoted to vision. I have found ...
5
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1answer
125 views

Perceptual flicker when rotating my face

Informal Experiment: I look up at a wooden beam on the ceiling, or I look at the office door; both the door and the ceiling are about 2 meters from my face. I rotate my face 90 degrees left or right ...
5
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2answers
123 views

How are humans able to read scrambled text/characters (e.g., CAPTCHA)?

So I'm doing a research on developing a new text-based CAPTCHA system. I've devised a scheme where characters in a text are broken/split individually and randomly, making it difficult for OCR machines ...
5
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1answer
70 views

Binocular rivalry in animals?

Are there any experiments on binocular rivalry in animals? (In humans, brain responses to Rubin's vase are for example well studied.)
5
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1answer
175 views

Computational model of biological object recognition

The human brain can achieve a remarkable ability to recognize visual patterns in an Invariant, selective and fast manner. The human visual system is quite powerful. It has an exquisite selectivity ...
5
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1answer
148 views

How is light processed by the human brain when awake and in dreams?

I've recently seen this great video: How your brain tells you where you are. The video discusses how certain cells within the brain fire based on proximity to objects. There are great examples of ...
5
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2answers
123 views

Inducing Auditory-to-Visual Synesthesia

I recently watched an interesting video that was discussing conveying color to the blind through language. It implied that there may be a way to insert the sensation of color into a person's mind via ...
5
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0answers
24 views

Is there a hierarchy of gestalt visual stimuli processing?

Let's say that we have a set of shapes. They can be grouped according to the different Gestalt laws of grouping. However, different Gestalt principles will divide the set into different groups, e.g. ...
5
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0answers
65 views

What functions does the brain perform to recognize a familiar object unconsciously?

Let's say a person's brain experiences how a vehicle/object looks for the very 1st time. It would require lot of attention/focus/processing to analyse the object, extract features and train its neural ...
4
votes
2answers
907 views

What does hemispatial neglect vision look like?

I need to know more about hemispatial neglect, in order to compose a picture of what it would look like to someone who has this issue. Is there any resources for finding more about their actual ...
4
votes
1answer
846 views

How does the brain read rotated text?

Suppose a human ran across a letter written at a 45 degree angle. How does the brain read this text? Most people don't often see text written at an angle, so it seems safe to assume that the brain ...
4
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1answer
79 views

Are we actually seeing black colored objects?

We know that black objects absorb light with almost all the frequencies of the visible spectrum. This means there will not be any frequency of light reflected and falling on our retina, in order for ...
4
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2answers
107 views

Is there a difference between visual short term memory and visual working memory?

As far as I can tell the two terms are used interchangeably. Do these two separate terms exist for historical reasons, or is there a distinction I'm missing?
4
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1answer
277 views

Does looking into a mirror relieve eye strain in a similar way to looking at distant objects?

Sometimes when having an eye exam the eye chart is viewed through a mirror to increase the distance between the person and the chart. When using consoles, it is recommended to look away from the ...
4
votes
1answer
54 views

Is there a difference between the time/effort it takes for the blind and the sighted to learn to read Braille?

The visually deprived brain undergoes extensive remodeling due to cross-modal plasticity. This leads to increased areas of the cortex being available for other purposes such as tactile processing. Now ...
4
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1answer
29 views

What study showed that humans can successfully detect objects within images once they are able to recognize those objects?

A professor in an online lecture I was watching referenced a study which he said showed that our ability as humans to detect objects within scenes (especially complex scenes) was very much connected ...
4
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1answer
56 views

Asaccadia adaptation

Can asaccadia (i.e., lack of saccades, due to neuronal or muscular damage) be overcome? Do other muscles (e.g., neck) compensate? Are the resulting gaze patterns the same as for saccades, and are they ...
4
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1answer
181 views

Sensory dissonance: Will the visual or auditory channel win?

Is there any research showing that our visual channel takes precedence over the auditory channel (or vice versa) if there is some dissonance between them? Examples: Say a person driving a car ...
4
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2answers
95 views

Eye movement tendencies for shades, sizes, shapes, and colours

I was asked this question yesterday Which of the following statements regarding research principles in visual attention is TRUE? The eyes tend to move from: a. Light to dark (shade) b. Large to ...
4
votes
1answer
66 views

What's the name of the quantifying preference for visual stimulus by varying size or distance as compared to a reference task?

Say that you enjoy looking at two beautiful paintings (A and B). But you really can't tell which one you like more, and you want to (quantitatively). So, you compare them both to your favorite ...
4
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0answers
61 views

The accuracy & malleability of memory for color

How accurate is colour memory for the standard person? It would seem most people are quite good at remembering the colour of objects by visualising the object. But in some cases peoples visualisation ...
4
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0answers
67 views

What would happen if you saw no form of light for a year?

It's proven that low levels of dopamine result in depression, anxiety, etc. And low levels of dopamine just means a lack of production or intake by the dopaminergic receptors. If the lack of happiness ...
4
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0answers
31 views

Grating orientation & frequency which induces highest gamma

I am doing some research on perception and gamma activity in V1 area. To check some of my results I need to find an experimental result, from which I would know which orientations and frequencies of ...
4
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0answers
62 views

Evidence for a 2-component framework of visual attention distribution

As part of my bachelor thesis on eyetracking-based gaze guidance, I've done quite a bit of reading (again) on visual attention and visual attention distribution. What caught my attention (haha) ...
4
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0answers
44 views

How is the focal point determined when looking into a clear sky?

When looking into a clear blue sky, no cloud, birds, trees or any object to give a frame of reference. When a person is actively looking, as opposed to day dreaming or gazing. The sky goes for a long ...
4
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0answers
42 views

Does the subjective experience of artificial light brightness vary for people, if so, by how much?

I'm thinking about human perception and particularly the experience of how bright artificial light is. I'm talking about dusk, when the sun has set and only street lamps and light reflecting off ...
3
votes
2answers
77 views

Does the retina encode visual information like a Bitmap or an SVG?

I heard recently that a scientist has developed a retina prosthesis. So I think this is a question that has an answer. Does the retina encode information like a Bitmap image or an SVG image? (A ...
3
votes
2answers
485 views

What is the maximum size of content the human eye can focus upon?

What is the maximum size of content the human eye can focus upon on a computer screen? Is there a general equation that gives this size as a measure of distance from the screen etc.? What is the ...
3
votes
1answer
71 views

Is consciousness a sub product of the brain or is there a duality? [duplicate]

I am trying to understand what consciousness is, based on my basic knowledge of our senses, artificial intelligence (computer vision, specifically) and some philosophy. Here's my reasoning: As far as ...
3
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1answer
674 views

Why do “cool” colors, which are actually warmer, look cool, and vice versa?

Why do cool colors look cool that are in fact warmer, and why do warm colors look warm when they are actually cooler? Blue wavelength has higher energy than red, i.e, blue flame is hotter than red ...
3
votes
1answer
59 views

How do hallucinations appear through reversing goggles?

If one is experiencing elaborated visual hallucinations, what will happen when one puts on reversing goggles? Will hallucinations change their orientations as well? Links to relevant papers will be ...
3
votes
1answer
2k views

Why do humans' eyes enter an unfocused gaze when recalling a memory or imagining something?

The question is self-explanatory (I hope). Is this trait unique to humans? Does the direction of the unfocused gaze indicate anything about which physical part of the brain is being utilized? Is ...
3
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1answer
260 views

What is the proper term for the synchronization of eye movements?

In humans and most two eyed species, eye movements synchronize so that both eyes are focused on the same point. This facilitates 3D vision significantly, allowing bifocal cues. I remember reading a ...
3
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1answer
51 views

Where can I find stimuli for steady-state visually-evoked potentials?

I am a student working on a project which deals with Steady State Visually-Evoked Potentials (SSVEP) Stimuator. Does anybody know where can I find stimuli (checkerboard or single graphic) as a video ...